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  • This paper deals with measurement of thermal capacity of electrically conductive materials. Combined furnace-direct resistance heating of sample is employed. Radiance heat transfer is reduced by proper shape of sample. Heat convection is eliminated by means of vacuum. The system is put into vacuum chamber. Vacuum also prevents the specimen from oxidation at high temperature. Sample is put into special furnace and its temperature is programmable. Temperature of the sample is measured by welded thermocouple. An electric rectangular pulse is brought into the sample and electric energy is changed directly into heat in sample volume. Amount of heat is calculated from pulse width, current and voltage across sample section. Voltage is sensed by probes welded in distance s on the sample. Current is measured by standard shunt. Specific thermal capacity (specific heat) is calculated from supplied heat, temperature rise and mass of the sample. Electrical resisitivity and thermal conductivity can be calculated
  • This paper deals with measurement of thermal capacity of electrically conductive materials. Combined furnace-direct resistance heating of sample is employed. Radiance heat transfer is reduced by proper shape of sample. Heat convection is eliminated by means of vacuum. The system is put into vacuum chamber. Vacuum also prevents the specimen from oxidation at high temperature. Sample is put into special furnace and its temperature is programmable. Temperature of the sample is measured by welded thermocouple. An electric rectangular pulse is brought into the sample and electric energy is changed directly into heat in sample volume. Amount of heat is calculated from pulse width, current and voltage across sample section. Voltage is sensed by probes welded in distance s on the sample. Current is measured by standard shunt. Specific thermal capacity (specific heat) is calculated from supplied heat, temperature rise and mass of the sample. Electrical resisitivity and thermal conductivity can be calculated (en)
  • Předložený článek se zabývá měřením měrné tepelné kapacity tuhých elektricky vodivých materiálů, metodou využívající kombinovaný ohřev v peci a přímý odporový ohřev. Přenos tepla zářením je redukován pomocí vhodného tvaru vzorku. Přenos tepla konvekcí je vyloučen uložením vzorku do vakua. Vakuum také chrání vzorek před oxidací při vysoké teplotě. Vzorek je vložen do speciální pece s programovatelnou teplotou. Teplota vzorku je měřena pomocí přivařeného termočlánku. Elektrický pravoúhlý pulz je přiveden do vzorku a elektrická energie je přeměněna přímo v teplo v objemu vzorku. Množství tepla je vypočteno z šířky pulzu, proudu a napětí podél sekce vzorku. Napětí je snímáno pomocí sond přivařených ve vzdálenosti s na vzorku. Proud je měřen bočníkem. Měrná tepelná kapacita je vypočtena z dodaného tepla, vzestupu teploty a hmotnosti sekce vzorku. Z naměřených hodnot může být také vypočtena elektrická rezistivita a součinitel tepelné vodivosti. (cs)
Title
  • Měření měrné tepelné kapacity technických slitin v závislosti na teplotě (cs)
  • Thermal Capacity Measurement of Engineering Alloys in Dependence on Temperature
  • Thermal Capacity Measurement of Engineering Alloys in Dependence on Temperature (en)
skos:prefLabel
  • Měření měrné tepelné kapacity technických slitin v závislosti na teplotě (cs)
  • Thermal Capacity Measurement of Engineering Alloys in Dependence on Temperature
  • Thermal Capacity Measurement of Engineering Alloys in Dependence on Temperature (en)
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  • RIV/61989100:27360/05:00013244!RIV06-GA0-27360___
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  • electrical resistivity; engineering alloys; specific heat; thermal conductivity; thermophysical properties (en)
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  • 27360
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